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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde192e728cadb6f07db44df1d440d9ddddd88f5a6e9d675c1fb39dbf9ca23d1' 
  AND token = '7j7nJ78Y1FkIrkYhUqWAwp5kqZKJ2HDFupt8BAV6FW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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