SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98002c4735f5c9c16fab425bfd9f4e9920bbc3ccfa17134229b4a05102ebeb8' 
  AND token = 'F+lRTpqGQuETwa89mzWpjJL+y/+B08xEMcKqKLgNjoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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