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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54e6e62cb73ba80939dd830977ed116f6d1950cfd807b0bf5b901badf791711' 
  AND token = '13Daye1BmH8X8xvTXUYMPpa9LT8yD64hc3TmrbgWszg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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