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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f13d775a043413a4d55e7b7a11ef6df523e46fd8d383458cf437d2ca0a51a15' 
  AND token = 'La9pbbGjRUz4kcptsQFNhv2CatkOGslpdnLpPOqNN6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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