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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dc3ccde8ffcbd9264a8149c9ef87117b6c464af423b57371d5a59a717e7d07' 
  AND token = 'onML5zkiQa74238BmdiabQuIj6ZMSx0CXpaA4KuwI40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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