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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ebe5e1ec83a0b97ba7a39ad4bd9481b44d97a7a1844971746806a302d1897a' 
  AND token = '69+2V9mOUcywghOj7JqxReUs7GtV6NA7ee2yCMCibTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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