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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf7a66a9cb780efdb18494a5b5f02737b47f02cc475c900d74b3490bc3bb3d4' 
  AND token = 'DtXVg/GDkJr+I0akuSW0FUj9yaYadA5T46KRuHCVD+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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