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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aa756ca286ede4a342c44b46729f7ecb0af00404a74e15234173a691c7fdb3' 
  AND token = '7vwC0JLzYTHttC2EWg7nvyrPvYtsb7K//Y34ZDYXjP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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