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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b39b66721589e38eb866812d49682c2ef2b5f2d9194b6576d926ac0c2da825' 
  AND token = '1aKZoAd8cdA7QUzklsfQRbf31rZ5DJQNO/xnUYN2DLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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