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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76459a7406405d2f0c9295be08da9fa2027368496dee049cbf8cacd53a59544' 
  AND token = 'wcmmVE7f1rf86RXVycug84N7fR2XKB+uiIJkztDmASQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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