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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeeebc6d2be4a69990df7afa0de1c4304520b4c5f588e39f63b6d77094483ad' 
  AND token = 'lHkEnWAkh3qiUgUlPmqpiR6tf1ZM37KubQUWMVAYGFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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