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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be663bb95ca769f804006a047d4a16e67503b1b6c5ba0abc0a33200098db71b' 
  AND token = 'AJcP0ujY9AQIHtvY9EnUBY1vjK7v8J1gcSG3m9RP/yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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