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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae489e3ea2f318d1165ef4965166910798d4e82236d4bcc9f58895c8e780677e' 
  AND token = 'MOxhIU6uQXq8203Tbz8nkZjD8jCyGlFk70nQNOhnwkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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