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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2566448de654c0794a7b91a1f124699584c125bfa85e6db3e90db4b839d9d835' 
  AND token = '4fuk6ErukzaKmCcFk8tuh3tJV4QsgV8R2aVLuP9cNCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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