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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b8fdc398c944606d94aaed533c4b82b609d8afaa6d7d07ff0093cd5e93032c' 
  AND token = 'NCTUTTOeC0jYheBBDhtElhX77WVMzfUUYVQbrqrx2Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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