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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048be995c62e35fbf171705be8cddba0cc0b4dbd3355b4e01511008e7bc46c49' 
  AND token = '15HtFUvl7r6pnswV0WVeMg8Lj6dyrwdWoj94L45mz0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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