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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c635911a2352ac41079f66fe5053333042af2f999b5b8e043c0f57a1a1b5f7aa' 
  AND token = 'XvlkiVP7y70zXn9EFXHEYGME9lG2QQBwl36YKplgVTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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