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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19013665f81aed1b05838a41ba1712561d2f7ddf0b9122f1193303bd0d074e23' 
  AND token = '9HUMYpXouN6YcAM+B1lD9GMlbGOh4sthBCZuoz+sM+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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