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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2065392ebaf00d369dbebe376f26efdabc6411280155c4fb5d42ba4ed6e3661f' 
  AND token = 'vnppbo5pYMCDscrU1LVTsT63PdWB1oImwA6yH4a5d3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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