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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba1d820054961f48ff18a4f8e0c00e65e55ce3f17a5a2b37fa98e894b87d2c8' 
  AND token = 'grNJB7tFbk3HgmEbzkTR6wwwRvomyXxxRLmD5B7i2Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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