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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4abea76368397d2c6779117b3642c01403594d7ebc1f87b6504bc6c27074b7' 
  AND token = 'EdHzy5d2y5W4Y5+gVEeRv5twdTzv7TWsLSd9/bjT7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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