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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936cbdd03ab1da0555ba176fdc9f3763455ae2f4c905987345d8c824820bd039' 
  AND token = 'aVe9VY9vuiPaXaiQ271ffiv5tvCzDGQ+TLcZhIUdCkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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