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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7370697cc15918383617c40feefc815672a4c7df53b8daa074b8878cebc92068' 
  AND token = 'fH6f+DrCnJ0G0Sq60yiFu7txa4RGVWozhELIamLzR0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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