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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b0664b977831713ebaa0c289c40a3e89dd4ab6d3ab9556f79e22eaf29a9623' 
  AND token = 'zNMcL9n1owIuF/n1jX/O4UwlNpeYBakoOB6rljWpezI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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