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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9695fd9fbe35d333b946f3472c70b512185190801078aebfba391c0e7f796a19' 
  AND token = 'Uqag3Ht9jFpTFTm7d8AhsPD/sQHQLEV/92jgGndR0Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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