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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9642a4b1f736f9811fbc97acbbfc71989e98904bd830837696e0da2604e4d71' 
  AND token = 'OuCZxH4nFIhf03wxmy9dkdC42uSjhc6Zc1T+/hGfCUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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