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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802e0ae21b6907fa404d6e99a391ab63d4849778ee3d50aefc1f73ffcd086b7e' 
  AND token = 'MKzC41GStkznEfby+kN6vbDlBfkAha7xwQELzAtGb6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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