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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91396cfe02f7c60adbfcd8b280ef2fc36cb9c13297d74aaae32c548d88215d9a' 
  AND token = 'Quxu6bK0QGNLnja04TpUo6ui7+CkBpYgdWlCHJzppco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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