SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2748512188bab379f84da430c681f014f51d76c6a93616d013769188e0cf865' 
  AND token = 'rBsrnP9KDJerqu6gCY1bmpjWB4FQV6fxxTD3PwjPYZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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