SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613656c60363485cb467510ac53e568fd08c2d4753fe8d7634b0f9432be18307' 
  AND token = 'Lc0eWqBtG7plA/rFxmK7+vpZQUpA2ECCzLj26U2Twzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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