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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82238f142c5708ae9581a1d683fe83587d0628e6f01e984456839152b7416654' 
  AND token = 'BuoxKRxEHq/SzmlKmsjgDo2a1l8DAv5fNNP+ETf5vpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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