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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5ebe62cd4e715e21fa6c0fbfb78a24561da283f9fed44855c9d7e5166afaaa' 
  AND token = '8MVR3LJnTS6xSp9cLcvmM9Ih6YJBh9MQ1ZguHCkkLmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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