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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9b55e6ea36401dbc3452479809da1dbba4a5333b44f50b21f2e919d2018f45' 
  AND token = 'szzZhm7qccJtThMMcXi7r71eCvUZh1ZU4JCRaQFS2Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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