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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5562bf3ee1a5d45265ba7a21e66a9ece4cf0e860751147aed18b98a683cb32' 
  AND token = '5xVNKhxRF+S1A2SjLgzNhY9ZsQlfCfNc0pCdPNPhz7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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