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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0484fbea82b543c87332385a340a38896c42b28d7393412269283f4a059937a8' 
  AND token = 'Xs6+cvtoAhX4B4Xb3LKF5W3lwmexwvVoTswiqyc6K3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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