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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9d981de48aeae67ea6b2064571916da55c08e8be9258047f7d7f63111b9bf7' 
  AND token = 'PNLHoAvOWj6aAfICbXfi0Ze/6rOQzUE9Qc62dPsljLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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