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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ac6068b461f7f9f5e801c059a8f413ac73f364a8d07ceba935cc20dd5d6c3c' 
  AND token = 'IUmYYX6yNuJ7BElHuKgBscyMoCDxanbAaTmwZHeF7eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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