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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54565aad445a6412790422f7613ed6ffd1126ed7e7ef5ff44203ae23ac49d46' 
  AND token = 'B2smgyn2gjkJ5IShW/fs9WYPKENBq3mTK9Qgv2Lv3O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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