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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1ffd4b07c930ef713f083b93997ca9c4cbbb665ca63af92b92feef4da81bbc' 
  AND token = 'lpv6GQzBZuvGX8V0slFb4+5oeemnmM++wUQXt1WECo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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