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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4c3afe192610dd1898a1d99b17420144c15c7e76935fb1e2c26770255570a8' 
  AND token = 'siBDqfA7UEOsXSwwDpKtzS9hXqUIrKzKcBLq6K9aP50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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