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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55fcceeff23d36f886e228839c60cf353790330c01b8c0a660d611768a64a46' 
  AND token = 'NqBO6f69kejo+WpUBuazHdc31Z03fHIRA6MDmlrs7wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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