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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dd5ac18bb6b052ed0b7d9d7a1eba9fd933e9b5dcd6d60cea4af2675b91aeab' 
  AND token = 'q52OD/EucE6Pp9Fgn9kgoOylehvXPXWf2ohYS0ODBu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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