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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14500da276a890f1fbe9aabc2ffa02398bfae073dfbfe5db7bd9ee80609b29e5' 
  AND token = 'xeu3OgSC4EmdzkpoHYY+Yl8Z26HkAGhUN6sSkTYq2R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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