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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b6aa9ed14444f6db0bd475acf8cb00749c5836118c4ca4a8a5b9db42533d41' 
  AND token = 'HLp0GHqTlRyy++tWY1aeQA18Hm0HThAX+U9lUwFG3ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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