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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ca783d15897d237925b86acf1ff7d56c0d2a7087fb8f5ea07af64ac030fd6b' 
  AND token = 'rhmTGkN+JbC8ih7ebRNdRujUPXgP8hqKlAiP4Nc7yVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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