SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a295bb9e3a50466f1d05190ce86ad455eb40acd75c314ae4ef0933d18574dc36' 
  AND token = 'ghlygcIVGgqjugoUPpcBkXVUbI1/KOifsGrZ822MwyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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