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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdab3508bd3be8224328ba18705dc72ca50345ee481c54726437a1afdd347c5' 
  AND token = 'bzd6H2MQaRPOXLhSweD+Aum9CQOXnbMlSQMm86N4uOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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