SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfe873f7ec740be83c74838c5b3381f2ec12053c5d695004283198c796a725a' 
  AND token = 'GtZ4qk7jY3phrW8q6vb1IUELjcZP+mbQE/kcBN/wRCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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