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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bbd677e8f94f94233e3b29e34a74d773fe162007c3f3834f3560ce8efa1905' 
  AND token = 'M/996EWcVXKMrd2lX9FutT/UrmaayrQ2a2MSdFzm2Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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