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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea69e8080b2ffb0bed219348d725996872200e04193acd5e44fb4dc90623cc11' 
  AND token = 'XYlDio4KSZsS/7zdolCldSf94i8ovJf6qPtsM12jodw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}