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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20790abc0bebcbe42a8ec4972600680dbc001bc12810a8eec385890aa5948ad' 
  AND token = '9he5TAKIO1BKFgl1zm1W7/mzocMK19YjStXC0LjpnHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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