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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df30ad0acc5780e00d59fb219044e42acce4634f18837f756f57d194af13f199' 
  AND token = 'nZBOxPlqAJXR+dHpaJFZbfu0KlmTAvkU0ZVDBkOOW7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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