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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e6027d89bc4b7e67bc5f7de50f93981812927a613582731769fe5d4f614635' 
  AND token = '8zhFRH1h9Bf/fVhzjECb7fEt6P8f+SJQBRI2DBFHM7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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