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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197ddab2e29f4027a633a4f0589cd729572f4dc7d596c9d105a2535b614dd4a8' 
  AND token = 'WB3w0JZW5kRJkmX3Rc2AjT41CFXe7IjHrHMn6JCvEkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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