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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2865ab62a2a1c3db558d5160cf1bbdc45354d8311a63be3b8fc7c578e9302d' 
  AND token = 'sgbjqBUDLshskkPE84MCJpdM15e8MfBWkVERrzDBLO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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