SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df664e57c17dda78840c9d78bddddf7067308353bf4775d6829219362bc6aff' 
  AND token = 'wVU6sCiWDuvh9qZI1ebum0mJC/xVJn9Fhw2Ghm/DWcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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