SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ef7ff4c4d02d86056d8f917e9dc81920782bc905379314a78d43ddfd059df1' 
  AND token = 'caL4wqnjwMbgqIeMfPJjq+nGfQCkbUmWGKWsQuS6zOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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