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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01db753d1c54e983dbac6b3712a32dc21c2c1f839713bfa9c3ccfb8d63d4cc5' 
  AND token = 'r/noxd2L86GKX+ttyzri7CI/o7MPSlhTRDDvq0WIXrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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