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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68082a1e9780a84be64637e8e5803886dfef970f229804d0f91c2bc13f42d978' 
  AND token = '9y9wlirPm7nHMnHy3QuWuwtD++zZEhAkQIaSK8Pr9uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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