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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a133db6812d0bdbaa0e9e3d31c7172ead74b8e320c3276ec967f764c02f7090d' 
  AND token = 'LnKi0anq60du7FbiqI7ThNAJD+OQH5++cGvV6mFpZGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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