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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95fbfb99b58b72619eb4d657e99ef864d1073e5792e0c8a2eac1c89fcfeb735' 
  AND token = 'staxVDkCQnHYY3a0E23h3yNNdyi2b1ZXaXdkD2Mgkfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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