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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761a43143368f6e047b7407d1e1119178704bece423e1fd76266f27503c22a42' 
  AND token = 'WrM5LS/R7AA3cyClr3sG8WNQvQUM5mUraU8IGB5NE7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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