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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4102f59d62c6bd5b7cdb46d781a83c6ff5f0ff5d8ef6acd8e98a8a806d31bdbe' 
  AND token = 'YWVc/bfn1SCCdrCbJ/ABzQA7BV8Q6LeL7PFdeElP304=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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