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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0277bf9a1edb416767a1065b3665e6b06d182153e53d412817b41e038e82fc' 
  AND token = 'mCXgOf6jzok5hu5CKe6AxN7hUE32f9uSXA0p5fSWgrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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