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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fcdf288def3c4ae4b2e2edb21e748bcbde3c3bfea4623a78af4d512edb9002' 
  AND token = 'zuLYInOrTvrWM775Zz2uY9rKBUHluzaV6oj/0uJgyvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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